关于物质，下面说法中对的是（　　）

智能手机耗电量大，移动充电宝应运而生．如图是一款移动充电宝的示意图：

（1）图中所示的物质中属于金属单质的是____ ，属于有机合成材料的是____ ．

（2）移动充电宝充电时，将电能转化为____ 能．

（3）写出只用一步反应表示铁比铜活泼的化学方程式：____ ．

（4）电池从早期的干电池发展到现在的燃料电池、锂电池等，由此请你谈一谈化学与生活的关系：____．

  Rick and Mary are from America．Now they are working in Tianjin．They can speak a little Chinese．Every morning they get up very early．Then they go to work by car.·They are very busy．They have lunch at the factory．①After lunch they work again．They finish their work very late．  In the evening they take Chinese lessons(上汉语课)．They want to talk with Chinese people．They often say，“Chinese people are very friendly(友好的)．”②They like to stay in China and they like to work with Chinese people．

根据短文内容，完成下列题目。